OA is B
The set Rn = Rnâ€“1 + 3 describes an evenly spaced set: each value is three more than the previous. For example the set could be 3, 6, 9, 12 . . .
For any evenly spaced set, the mean of the set is always equal to the median. A set of consecutive integers is an example of an evenly spaced set. If we find the mean of this set, we will be able to find the median because they are the same.
(1) INSUFFICIENT: This does not give us any information about the value of the mean. The only other way to find the median of a set is to know every term of the set.
(2) SUFFICIENT: The mean must be the median of the set since this is an evenly spaced set. This statement tells us that mean is 36. Therefore, the median must be 36.
The correct answer is B.
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